fs/dlm/config.c

   1 /******************************************************************************
   2 *******************************************************************************
   3 **
   4 **  Copyright (C) Sistina Software, Inc.  1997-2003  All rights reserved.
   5 **  Copyright (C) 2004-2011 Red Hat, Inc.  All rights reserved.
   6 **
   7 **  This copyrighted material is made available to anyone wishing to use,
   8 **  modify, copy, or redistribute it subject to the terms and conditions
   9 **  of the GNU General Public License v.2.
  10 **
  11 *******************************************************************************
  12 ******************************************************************************/
  13
  14 #include <linux/kernel.h>
  15 #include <linux/init.h>
  16 #include <linux/configfs.h>
  17 #include <linux/slab.h>
  18 #include <linux/in.h>
  19 #include <linux/in6.h>
  20 #include <linux/dlmconstants.h>
  21 #include <net/ipv6.h>
  22 #include <net/sock.h>
  23
  24 #include "config.h"
  25 #include "lowcomms.h"
  26
  27 /*
  28  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/nodeid
  29  * /config/dlm/<cluster>/spaces/<space>/nodes/<node>/weight
  30  * /config/dlm/<cluster>/comms/<comm>/nodeid
  31  * /config/dlm/<cluster>/comms/<comm>/local
  32  * /config/dlm/<cluster>/comms/<comm>/addr      (write only)
  33  * /config/dlm/<cluster>/comms/<comm>/addr_list (read only)
  34  * The <cluster> level is useless, but I haven't figured out how to avoid it.
  35  */
  36
  37 static struct config_group *space_list;
  38 static struct config_group *comm_list;
  39 static struct dlm_comm *local_comm;
  40 static uint32_t dlm_comm_count;
  41
  42 struct dlm_clusters;
  43 struct dlm_cluster;
  44 struct dlm_spaces;
  45 struct dlm_space;
  46 struct dlm_comms;
  47 struct dlm_comm;
  48 struct dlm_nodes;
  49 struct dlm_node;
  50
  51 static struct config_group *make_cluster(struct config_group *, const char *);
  52 static void drop_cluster(struct config_group *, struct config_item *);
  53 static void release_cluster(struct config_item *);
  54 static struct config_group *make_space(struct config_group *, const char *);
  55 static void drop_space(struct config_group *, struct config_item *);
  56 static void release_space(struct config_item *);
  57 static struct config_item *make_comm(struct config_group *, const char *);
  58 static void drop_comm(struct config_group *, struct config_item *);
  59 static void release_comm(struct config_item *);
  60 static struct config_item *make_node(struct config_group *, const char *);
  61 static void drop_node(struct config_group *, struct config_item *);
  62 static void release_node(struct config_item *);
  63
  64 static struct configfs_attribute *comm_attrs[];
  65 static struct configfs_attribute *node_attrs[];
  66
  67 struct dlm_cluster {
  68         struct config_group group;
  69         unsigned int cl_tcp_port;
  70         unsigned int cl_buffer_size;
  71         unsigned int cl_rsbtbl_size;
  72         unsigned int cl_recover_timer;
  73         unsigned int cl_toss_secs;
  74         unsigned int cl_scan_secs;
  75         unsigned int cl_log_debug;
  76         unsigned int cl_log_info;
  77         unsigned int cl_protocol;
  78         unsigned int cl_timewarn_cs;
  79         unsigned int cl_waitwarn_us;
  80         unsigned int cl_new_rsb_count;
  81         unsigned int cl_recover_callbacks;
  82         char cl_cluster_name[DLM_LOCKSPACE_LEN];
  83 };
  84
  85 static struct dlm_cluster *config_item_to_cluster(struct config_item *i)
  86 {
  87         return i ? container_of(to_config_group(i), struct dlm_cluster, group) :
  88                    NULL;
  89 }
  90
  91 enum {
  92         CLUSTER_ATTR_TCP_PORT = 0,
  93         CLUSTER_ATTR_BUFFER_SIZE,
  94         CLUSTER_ATTR_RSBTBL_SIZE,
  95         CLUSTER_ATTR_RECOVER_TIMER,
  96         CLUSTER_ATTR_TOSS_SECS,
  97         CLUSTER_ATTR_SCAN_SECS,
  98         CLUSTER_ATTR_LOG_DEBUG,
  99         CLUSTER_ATTR_LOG_INFO,
 100         CLUSTER_ATTR_PROTOCOL,
 101         CLUSTER_ATTR_TIMEWARN_CS,
 102         CLUSTER_ATTR_WAITWARN_US,
 103         CLUSTER_ATTR_NEW_RSB_COUNT,
 104         CLUSTER_ATTR_RECOVER_CALLBACKS,
 105         CLUSTER_ATTR_CLUSTER_NAME,
 106 };
 107
 108 static ssize_t cluster_cluster_name_show(struct config_item *item, char *buf)
 109 {
 110         struct dlm_cluster *cl = config_item_to_cluster(item);
 111         return sprintf(buf, "%s\n", cl->cl_cluster_name);
 112 }
 113
 114 static ssize_t cluster_cluster_name_store(struct config_item *item,
 115                                           const char *buf, size_t len)
 116 {
 117         struct dlm_cluster *cl = config_item_to_cluster(item);
 118
 119         strlcpy(dlm_config.ci_cluster_name, buf,
 120                                 sizeof(dlm_config.ci_cluster_name));
 121         strlcpy(cl->cl_cluster_name, buf, sizeof(cl->cl_cluster_name));
 122         return len;
 123 }
 124
 125 CONFIGFS_ATTR(cluster_, cluster_name);
 126
 127 static ssize_t cluster_set(struct dlm_cluster *cl, unsigned int *cl_field,
 128                            int *info_field, int check_zero,
 129                            const char *buf, size_t len)
 130 {
 131         unsigned int x;
 132         int rc;
 133
 134         if (!capable(CAP_SYS_ADMIN))
 135                 return -EPERM;
 136         rc = kstrtouint(buf, 0, &x);
 137         if (rc)
 138                 return rc;
 139
 140         if (check_zero && !x)
 141                 return -EINVAL;
 142
 143         *cl_field = x;
 144         *info_field = x;
 145
 146         return len;
 147 }
 148
 149 #define CLUSTER_ATTR(name, check_zero)                                        \
 150 static ssize_t cluster_##name##_store(struct config_item *item, \
 151                 const char *buf, size_t len) \
 152 {                                                                             \
 153         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 154         return cluster_set(cl, &cl->cl_##name, &dlm_config.ci_##name,         \
 155                            check_zero, buf, len);                             \
 156 }                                                                             \
 157 static ssize_t cluster_##name##_show(struct config_item *item, char *buf)     \
 158 {                                                                             \
 159         struct dlm_cluster *cl = config_item_to_cluster(item);                \
 160         return snprintf(buf, PAGE_SIZE, "%u\n", cl->cl_##name);               \
 161 }                                                                             \
 162 CONFIGFS_ATTR(cluster_, name);
 163
 164 CLUSTER_ATTR(tcp_port, 1);
 165 CLUSTER_ATTR(buffer_size, 1);
 166 CLUSTER_ATTR(rsbtbl_size, 1);
 167 CLUSTER_ATTR(recover_timer, 1);
 168 CLUSTER_ATTR(toss_secs, 1);
 169 CLUSTER_ATTR(scan_secs, 1);
 170 CLUSTER_ATTR(log_debug, 0);
 171 CLUSTER_ATTR(log_info, 0);
 172 CLUSTER_ATTR(protocol, 0);
 173 CLUSTER_ATTR(timewarn_cs, 1);
 174 CLUSTER_ATTR(waitwarn_us, 0);
 175 CLUSTER_ATTR(new_rsb_count, 0);
 176 CLUSTER_ATTR(recover_callbacks, 0);
 177
 178 static struct configfs_attribute *cluster_attrs[] = {
 179         [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port,
 180         [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size,
 181         [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size,
 182         [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer,
 183         [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs,
 184         [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs,
 185         [CLUSTER_ATTR_LOG_DEBUG] = &cluster_attr_log_debug,
 186         [CLUSTER_ATTR_LOG_INFO] = &cluster_attr_log_info,
 187         [CLUSTER_ATTR_PROTOCOL] = &cluster_attr_protocol,
 188         [CLUSTER_ATTR_TIMEWARN_CS] = &cluster_attr_timewarn_cs,
 189         [CLUSTER_ATTR_WAITWARN_US] = &cluster_attr_waitwarn_us,
 190         [CLUSTER_ATTR_NEW_RSB_COUNT] = &cluster_attr_new_rsb_count,
 191         [CLUSTER_ATTR_RECOVER_CALLBACKS] = &cluster_attr_recover_callbacks,
 192         [CLUSTER_ATTR_CLUSTER_NAME] = &cluster_attr_cluster_name,
 193         NULL,
 194 };
 195
 196 enum {
 197         COMM_ATTR_NODEID = 0,
 198         COMM_ATTR_LOCAL,
 199         COMM_ATTR_ADDR,
 200         COMM_ATTR_ADDR_LIST,
 201 };
 202
 203 enum {
 204         NODE_ATTR_NODEID = 0,
 205         NODE_ATTR_WEIGHT,
 206 };
 207
 208 struct dlm_clusters {
 209         struct configfs_subsystem subsys;
 210 };
 211
 212 struct dlm_spaces {
 213         struct config_group ss_group;
 214 };
 215
 216 struct dlm_space {
 217         struct config_group group;
 218         struct list_head members;
 219         struct mutex members_lock;
 220         int members_count;
 221         struct dlm_nodes *nds;
 222 };
 223
 224 struct dlm_comms {
 225         struct config_group cs_group;
 226 };
 227
 228 struct dlm_comm {
 229         struct config_item item;
 230         int seq;
 231         int nodeid;
 232         int local;
 233         int addr_count;
 234         struct sockaddr_storage *addr[DLM_MAX_ADDR_COUNT];
 235 };
 236
 237 struct dlm_nodes {
 238         struct config_group ns_group;
 239 };
 240
 241 struct dlm_node {
 242         struct config_item item;
 243         struct list_head list; /* space->members */
 244         int nodeid;
 245         int weight;
 246         int new;
 247         int comm_seq; /* copy of cm->seq when nd->nodeid is set */
 248 };
 249
 250 static struct configfs_group_operations clusters_ops = {
 251         .make_group = make_cluster,
 252         .drop_item = drop_cluster,
 253 };
 254
 255 static struct configfs_item_operations cluster_ops = {
 256         .release = release_cluster,
 257 };
 258
 259 static struct configfs_group_operations spaces_ops = {
 260         .make_group = make_space,
 261         .drop_item = drop_space,
 262 };
 263
 264 static struct configfs_item_operations space_ops = {
 265         .release = release_space,
 266 };
 267
 268 static struct configfs_group_operations comms_ops = {
 269         .make_item = make_comm,
 270         .drop_item = drop_comm,
 271 };
 272
 273 static struct configfs_item_operations comm_ops = {
 274         .release = release_comm,
 275 };
 276
 277 static struct configfs_group_operations nodes_ops = {
 278         .make_item = make_node,
 279         .drop_item = drop_node,
 280 };
 281
 282 static struct configfs_item_operations node_ops = {
 283         .release = release_node,
 284 };
 285
 286 static struct config_item_type clusters_type = {
 287         .ct_group_ops = &clusters_ops,
 288         .ct_owner = THIS_MODULE,
 289 };
 290
 291 static struct config_item_type cluster_type = {
 292         .ct_item_ops = &cluster_ops,
 293         .ct_attrs = cluster_attrs,
 294         .ct_owner = THIS_MODULE,
 295 };
 296
 297 static struct config_item_type spaces_type = {
 298         .ct_group_ops = &spaces_ops,
 299         .ct_owner = THIS_MODULE,
 300 };
 301
 302 static struct config_item_type space_type = {
 303         .ct_item_ops = &space_ops,
 304         .ct_owner = THIS_MODULE,
 305 };
 306
 307 static struct config_item_type comms_type = {
 308         .ct_group_ops = &comms_ops,
 309         .ct_owner = THIS_MODULE,
 310 };
 311
 312 static struct config_item_type comm_type = {
 313         .ct_item_ops = &comm_ops,
 314         .ct_attrs = comm_attrs,
 315         .ct_owner = THIS_MODULE,
 316 };
 317
 318 static struct config_item_type nodes_type = {
 319         .ct_group_ops = &nodes_ops,
 320         .ct_owner = THIS_MODULE,
 321 };
 322
 323 static struct config_item_type node_type = {
 324         .ct_item_ops = &node_ops,
 325         .ct_attrs = node_attrs,
 326         .ct_owner = THIS_MODULE,
 327 };
 328
 329 static struct dlm_space *config_item_to_space(struct config_item *i)
 330 {
 331         return i ? container_of(to_config_group(i), struct dlm_space, group) :
 332                    NULL;
 333 }
 334
 335 static struct dlm_comm *config_item_to_comm(struct config_item *i)
 336 {
 337         return i ? container_of(i, struct dlm_comm, item) : NULL;
 338 }
 339
 340 static struct dlm_node *config_item_to_node(struct config_item *i)
 341 {
 342         return i ? container_of(i, struct dlm_node, item) : NULL;
 343 }
 344
 345 static struct config_group *make_cluster(struct config_group *g,
 346                                          const char *name)
 347 {
 348         struct dlm_cluster *cl = NULL;
 349         struct dlm_spaces *sps = NULL;
 350         struct dlm_comms *cms = NULL;
 351
 352         cl = kzalloc(sizeof(struct dlm_cluster), GFP_NOFS);
 353         sps = kzalloc(sizeof(struct dlm_spaces), GFP_NOFS);
 354         cms = kzalloc(sizeof(struct dlm_comms), GFP_NOFS);
 355
 356         if (!cl || !sps || !cms)
 357                 goto fail;
 358
 359         config_group_init_type_name(&cl->group, name, &cluster_type);
 360         config_group_init_type_name(&sps->ss_group, "spaces", &spaces_type);
 361         config_group_init_type_name(&cms->cs_group, "comms", &comms_type);
 362
 363         configfs_add_default_group(&sps->ss_group, &cl->group);
 364         configfs_add_default_group(&cms->cs_group, &cl->group);
 365
 366         cl->cl_tcp_port = dlm_config.ci_tcp_port;
 367         cl->cl_buffer_size = dlm_config.ci_buffer_size;
 368         cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size;
 369         cl->cl_recover_timer = dlm_config.ci_recover_timer;
 370         cl->cl_toss_secs = dlm_config.ci_toss_secs;
 371         cl->cl_scan_secs = dlm_config.ci_scan_secs;
 372         cl->cl_log_debug = dlm_config.ci_log_debug;
 373         cl->cl_log_info = dlm_config.ci_log_info;
 374         cl->cl_protocol = dlm_config.ci_protocol;
 375         cl->cl_timewarn_cs = dlm_config.ci_timewarn_cs;
 376         cl->cl_waitwarn_us = dlm_config.ci_waitwarn_us;
 377         cl->cl_new_rsb_count = dlm_config.ci_new_rsb_count;
 378         cl->cl_recover_callbacks = dlm_config.ci_recover_callbacks;
 379         memcpy(cl->cl_cluster_name, dlm_config.ci_cluster_name,
 380                DLM_LOCKSPACE_LEN);
 381
 382         space_list = &sps->ss_group;
 383         comm_list = &cms->cs_group;
 384         return &cl->group;
 385
 386  fail:
 387         kfree(cl);
 388         kfree(sps);
 389         kfree(cms);
 390         return ERR_PTR(-ENOMEM);
 391 }
 392
 393 static void drop_cluster(struct config_group *g, struct config_item *i)
 394 {
 395         struct dlm_cluster *cl = config_item_to_cluster(i);
 396
 397         configfs_remove_default_groups(&cl->group);
 398
 399         space_list = NULL;
 400         comm_list = NULL;
 401
 402         config_item_put(i);
 403 }
 404
 405 static void release_cluster(struct config_item *i)
 406 {
 407         struct dlm_cluster *cl = config_item_to_cluster(i);
 408         kfree(cl);
 409 }
 410
 411 static struct config_group *make_space(struct config_group *g, const char *name)
 412 {
 413         struct dlm_space *sp = NULL;
 414         struct dlm_nodes *nds = NULL;
 415
 416         sp = kzalloc(sizeof(struct dlm_space), GFP_NOFS);
 417         nds = kzalloc(sizeof(struct dlm_nodes), GFP_NOFS);
 418
 419         if (!sp || !nds)
 420                 goto fail;
 421
 422         config_group_init_type_name(&sp->group, name, &space_type);
 423
 424         config_group_init_type_name(&nds->ns_group, "nodes", &nodes_type);
 425         configfs_add_default_group(&nds->ns_group, &sp->group);
 426
 427         INIT_LIST_HEAD(&sp->members);
 428         mutex_init(&sp->members_lock);
 429         sp->members_count = 0;
 430         sp->nds = nds;
 431         return &sp->group;
 432
 433  fail:
 434         kfree(sp);
 435         kfree(nds);
 436         return ERR_PTR(-ENOMEM);
 437 }
 438
 439 static void drop_space(struct config_group *g, struct config_item *i)
 440 {
 441         struct dlm_space *sp = config_item_to_space(i);
 442
 443         /* assert list_empty(&sp->members) */
 444
 445         configfs_remove_default_groups(&sp->group);
 446         config_item_put(i);
 447 }
 448
 449 static void release_space(struct config_item *i)
 450 {
 451         struct dlm_space *sp = config_item_to_space(i);
 452         kfree(sp->nds);
 453         kfree(sp);
 454 }
 455
 456 static struct config_item *make_comm(struct config_group *g, const char *name)
 457 {
 458         struct dlm_comm *cm;
 459
 460         cm = kzalloc(sizeof(struct dlm_comm), GFP_NOFS);
 461         if (!cm)
 462                 return ERR_PTR(-ENOMEM);
 463
 464         config_item_init_type_name(&cm->item, name, &comm_type);
 465
 466         cm->seq = dlm_comm_count++;
 467         if (!cm->seq)
 468                 cm->seq = dlm_comm_count++;
 469
 470         cm->nodeid = -1;
 471         cm->local = 0;
 472         cm->addr_count = 0;
 473         return &cm->item;
 474 }
 475
 476 static void drop_comm(struct config_group *g, struct config_item *i)
 477 {
 478         struct dlm_comm *cm = config_item_to_comm(i);
 479         if (local_comm == cm)
 480                 local_comm = NULL;
 481         dlm_lowcomms_close(cm->nodeid);
 482         while (cm->addr_count--)
 483                 kfree(cm->addr[cm->addr_count]);
 484         config_item_put(i);
 485 }
 486
 487 static void release_comm(struct config_item *i)
 488 {
 489         struct dlm_comm *cm = config_item_to_comm(i);
 490         kfree(cm);
 491 }
 492
 493 static struct config_item *make_node(struct config_group *g, const char *name)
 494 {
 495         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 496         struct dlm_node *nd;
 497
 498         nd = kzalloc(sizeof(struct dlm_node), GFP_NOFS);
 499         if (!nd)
 500                 return ERR_PTR(-ENOMEM);
 501
 502         config_item_init_type_name(&nd->item, name, &node_type);
 503         nd->nodeid = -1;
 504         nd->weight = 1;  /* default weight of 1 if none is set */
 505         nd->new = 1;     /* set to 0 once it's been read by dlm_nodeid_list() */
 506
 507         mutex_lock(&sp->members_lock);
 508         list_add(&nd->list, &sp->members);
 509         sp->members_count++;
 510         mutex_unlock(&sp->members_lock);
 511
 512         return &nd->item;
 513 }
 514
 515 static void drop_node(struct config_group *g, struct config_item *i)
 516 {
 517         struct dlm_space *sp = config_item_to_space(g->cg_item.ci_parent);
 518         struct dlm_node *nd = config_item_to_node(i);
 519
 520         mutex_lock(&sp->members_lock);
 521         list_del(&nd->list);
 522         sp->members_count--;
 523         mutex_unlock(&sp->members_lock);
 524
 525         config_item_put(i);
 526 }
 527
 528 static void release_node(struct config_item *i)
 529 {
 530         struct dlm_node *nd = config_item_to_node(i);
 531         kfree(nd);
 532 }
 533
 534 static struct dlm_clusters clusters_root = {
 535         .subsys = {
 536                 .su_group = {
 537                         .cg_item = {
 538                                 .ci_namebuf = "dlm",
 539                                 .ci_type = &clusters_type,
 540                         },
 541                 },
 542         },
 543 };
 544
 545 int __init dlm_config_init(void)
 546 {
 547         config_group_init(&clusters_root.subsys.su_group);
 548         mutex_init(&clusters_root.subsys.su_mutex);
 549         return configfs_register_subsystem(&clusters_root.subsys);
 550 }
 551
 552 void dlm_config_exit(void)
 553 {
 554         configfs_unregister_subsystem(&clusters_root.subsys);
 555 }
 556
 557 /*
 558  * Functions for user space to read/write attributes
 559  */
 560
 561 static ssize_t comm_nodeid_show(struct config_item *item, char *buf)
 562 {
 563         return sprintf(buf, "%d\n", config_item_to_comm(item)->nodeid);
 564 }
 565
 566 static ssize_t comm_nodeid_store(struct config_item *item, const char *buf,
 567                                  size_t len)
 568 {
 569         int rc = kstrtoint(buf, 0, &config_item_to_comm(item)->nodeid);
 570
 571         if (rc)
 572                 return rc;
 573         return len;
 574 }
 575
 576 static ssize_t comm_local_show(struct config_item *item, char *buf)
 577 {
 578         return sprintf(buf, "%d\n", config_item_to_comm(item)->local);
 579 }
 580
 581 static ssize_t comm_local_store(struct config_item *item, const char *buf,
 582                                 size_t len)
 583 {
 584         struct dlm_comm *cm = config_item_to_comm(item);
 585         int rc = kstrtoint(buf, 0, &cm->local);
 586
 587         if (rc)
 588                 return rc;
 589         if (cm->local && !local_comm)
 590                 local_comm = cm;
 591         return len;
 592 }
 593
 594 static ssize_t comm_addr_store(struct config_item *item, const char *buf,
 595                 size_t len)
 596 {
 597         struct dlm_comm *cm = config_item_to_comm(item);
 598         struct sockaddr_storage *addr;
 599         int rv;
 600
 601         if (len != sizeof(struct sockaddr_storage))
 602                 return -EINVAL;
 603
 604         if (cm->addr_count >= DLM_MAX_ADDR_COUNT)
 605                 return -ENOSPC;
 606
 607         addr = kzalloc(sizeof(*addr), GFP_NOFS);
 608         if (!addr)
 609                 return -ENOMEM;
 610
 611         memcpy(addr, buf, len);
 612
 613         rv = dlm_lowcomms_addr(cm->nodeid, addr, len);
 614         if (rv) {
 615                 kfree(addr);
 616                 return rv;
 617         }
 618
 619         cm->addr[cm->addr_count++] = addr;
 620         return len;
 621 }
 622
 623 static ssize_t comm_addr_list_show(struct config_item *item, char *buf)
 624 {
 625         struct dlm_comm *cm = config_item_to_comm(item);
 626         ssize_t s;
 627         ssize_t allowance;
 628         int i;
 629         struct sockaddr_storage *addr;
 630         struct sockaddr_in *addr_in;
 631         struct sockaddr_in6 *addr_in6;
 632
 633         /* Taken from ip6_addr_string() defined in lib/vsprintf.c */
 634         char buf0[sizeof("AF_INET6      xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255\n")];
 635
 636
 637         /* Derived from SIMPLE_ATTR_SIZE of fs/configfs/file.c */
 638         allowance = 4096;
 639         buf[0] = '\0';
 640
 641         for (i = 0; i < cm->addr_count; i++) {
 642                 addr = cm->addr[i];
 643
 644                 switch(addr->ss_family) {
 645                 case AF_INET:
 646                         addr_in = (struct sockaddr_in *)addr;
 647                         s = sprintf(buf0, "AF_INET      %pI4\n", &addr_in->sin_addr.s_addr);
 648                         break;
 649                 case AF_INET6:
 650                         addr_in6 = (struct sockaddr_in6 *)addr;
 651                         s = sprintf(buf0, "AF_INET6     %pI6\n", &addr_in6->sin6_addr);
 652                         break;
 653                 default:
 654                         s = sprintf(buf0, "%s\n", "<UNKNOWN>");
 655                         break;
 656                 }
 657                 allowance -= s;
 658                 if (allowance >= 0)
 659                         strcat(buf, buf0);
 660                 else {
 661                         allowance += s;
 662                         break;
 663                 }
 664         }
 665         return 4096 - allowance;
 666 }
 667
 668 CONFIGFS_ATTR(comm_, nodeid);
 669 CONFIGFS_ATTR(comm_, local);
 670 CONFIGFS_ATTR_WO(comm_, addr);
 671 CONFIGFS_ATTR_RO(comm_, addr_list);
 672
 673 static struct configfs_attribute *comm_attrs[] = {
 674         [COMM_ATTR_NODEID] = &comm_attr_nodeid,
 675         [COMM_ATTR_LOCAL] = &comm_attr_local,
 676         [COMM_ATTR_ADDR] = &comm_attr_addr,
 677         [COMM_ATTR_ADDR_LIST] = &comm_attr_addr_list,
 678         NULL,
 679 };
 680
 681 static ssize_t node_nodeid_show(struct config_item *item, char *buf)
 682 {
 683         return sprintf(buf, "%d\n", config_item_to_node(item)->nodeid);
 684 }
 685
 686 static ssize_t node_nodeid_store(struct config_item *item, const char *buf,
 687                                  size_t len)
 688 {
 689         struct dlm_node *nd = config_item_to_node(item);
 690         uint32_t seq = 0;
 691         int rc = kstrtoint(buf, 0, &nd->nodeid);
 692
 693         if (rc)
 694                 return rc;
 695         dlm_comm_seq(nd->nodeid, &seq);
 696         nd->comm_seq = seq;
 697         return len;
 698 }
 699
 700 static ssize_t node_weight_show(struct config_item *item, char *buf)
 701 {
 702         return sprintf(buf, "%d\n", config_item_to_node(item)->weight);
 703 }
 704
 705 static ssize_t node_weight_store(struct config_item *item, const char *buf,
 706                                  size_t len)
 707 {
 708         int rc = kstrtoint(buf, 0, &config_item_to_node(item)->weight);
 709
 710         if (rc)
 711                 return rc;
 712         return len;
 713 }
 714
 715 CONFIGFS_ATTR(node_, nodeid);
 716 CONFIGFS_ATTR(node_, weight);
 717
 718 static struct configfs_attribute *node_attrs[] = {
 719         [NODE_ATTR_NODEID] = &node_attr_nodeid,
 720         [NODE_ATTR_WEIGHT] = &node_attr_weight,
 721         NULL,
 722 };
 723
 724 /*
 725  * Functions for the dlm to get the info that's been configured
 726  */
 727
 728 static struct dlm_space *get_space(char *name)
 729 {
 730         struct config_item *i;
 731
 732         if (!space_list)
 733                 return NULL;
 734
 735         mutex_lock(&space_list->cg_subsys->su_mutex);
 736         i = config_group_find_item(space_list, name);
 737         mutex_unlock(&space_list->cg_subsys->su_mutex);
 738
 739         return config_item_to_space(i);
 740 }
 741
 742 static void put_space(struct dlm_space *sp)
 743 {
 744         config_item_put(&sp->group.cg_item);
 745 }
 746
 747 static struct dlm_comm *get_comm(int nodeid)
 748 {
 749         struct config_item *i;
 750         struct dlm_comm *cm = NULL;
 751         int found = 0;
 752
 753         if (!comm_list)
 754                 return NULL;
 755
 756         mutex_lock(&clusters_root.subsys.su_mutex);
 757
 758         list_for_each_entry(i, &comm_list->cg_children, ci_entry) {
 759                 cm = config_item_to_comm(i);
 760
 761                 if (cm->nodeid != nodeid)
 762                         continue;
 763                 found = 1;
 764                 config_item_get(i);
 765                 break;
 766         }
 767         mutex_unlock(&clusters_root.subsys.su_mutex);
 768
 769         if (!found)
 770                 cm = NULL;
 771         return cm;
 772 }
 773
 774 static void put_comm(struct dlm_comm *cm)
 775 {
 776         config_item_put(&cm->item);
 777 }
 778
 779 /* caller must free mem */
 780 int dlm_config_nodes(char *lsname, struct dlm_config_node **nodes_out,
 781                      int *count_out)
 782 {
 783         struct dlm_space *sp;
 784         struct dlm_node *nd;
 785         struct dlm_config_node *nodes, *node;
 786         int rv, count;
 787
 788         sp = get_space(lsname);
 789         if (!sp)
 790                 return -EEXIST;
 791
 792         mutex_lock(&sp->members_lock);
 793         if (!sp->members_count) {
 794                 rv = -EINVAL;
 795                 printk(KERN_ERR "dlm: zero members_count\n");
 796                 goto out;
 797         }
 798
 799         count = sp->members_count;
 800
 801         nodes = kcalloc(count, sizeof(struct dlm_config_node), GFP_NOFS);
 802         if (!nodes) {
 803                 rv = -ENOMEM;
 804                 goto out;
 805         }
 806
 807         node = nodes;
 808         list_for_each_entry(nd, &sp->members, list) {
 809                 node->nodeid = nd->nodeid;
 810                 node->weight = nd->weight;
 811                 node->new = nd->new;
 812                 node->comm_seq = nd->comm_seq;
 813                 node++;
 814
 815                 nd->new = 0;
 816         }
 817
 818         *count_out = count;
 819         *nodes_out = nodes;
 820         rv = 0;
 821  out:
 822         mutex_unlock(&sp->members_lock);
 823         put_space(sp);
 824         return rv;
 825 }
 826
 827 int dlm_comm_seq(int nodeid, uint32_t *seq)
 828 {
 829         struct dlm_comm *cm = get_comm(nodeid);
 830         if (!cm)
 831                 return -EEXIST;
 832         *seq = cm->seq;
 833         put_comm(cm);
 834         return 0;
 835 }
 836
 837 int dlm_our_nodeid(void)
 838 {
 839         return local_comm ? local_comm->nodeid : 0;
 840 }
 841
 842 /* num 0 is first addr, num 1 is second addr */
 843 int dlm_our_addr(struct sockaddr_storage *addr, int num)
 844 {
 845         if (!local_comm)
 846                 return -1;
 847         if (num + 1 > local_comm->addr_count)
 848                 return -1;
 849         memcpy(addr, local_comm->addr[num], sizeof(*addr));
 850         return 0;
 851 }
 852
 853 /* Config file defaults */
 854 #define DEFAULT_TCP_PORT       21064
 855 #define DEFAULT_BUFFER_SIZE     4096
 856 #define DEFAULT_RSBTBL_SIZE     1024
 857 #define DEFAULT_RECOVER_TIMER      5
 858 #define DEFAULT_TOSS_SECS         10
 859 #define DEFAULT_SCAN_SECS          5
 860 #define DEFAULT_LOG_DEBUG          0
 861 #define DEFAULT_LOG_INFO           1
 862 #define DEFAULT_PROTOCOL           0
 863 #define DEFAULT_TIMEWARN_CS      500 /* 5 sec = 500 centiseconds */
 864 #define DEFAULT_WAITWARN_US        0
 865 #define DEFAULT_NEW_RSB_COUNT    128
 866 #define DEFAULT_RECOVER_CALLBACKS  0
 867 #define DEFAULT_CLUSTER_NAME      ""
 868
 869 struct dlm_config_info dlm_config = {
 870         .ci_tcp_port = DEFAULT_TCP_PORT,
 871         .ci_buffer_size = DEFAULT_BUFFER_SIZE,
 872         .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE,
 873         .ci_recover_timer = DEFAULT_RECOVER_TIMER,
 874         .ci_toss_secs = DEFAULT_TOSS_SECS,
 875         .ci_scan_secs = DEFAULT_SCAN_SECS,
 876         .ci_log_debug = DEFAULT_LOG_DEBUG,
 877         .ci_log_info = DEFAULT_LOG_INFO,
 878         .ci_protocol = DEFAULT_PROTOCOL,
 879         .ci_timewarn_cs = DEFAULT_TIMEWARN_CS,
 880         .ci_waitwarn_us = DEFAULT_WAITWARN_US,
 881         .ci_new_rsb_count = DEFAULT_NEW_RSB_COUNT,
 882         .ci_recover_callbacks = DEFAULT_RECOVER_CALLBACKS,
 883         .ci_cluster_name = DEFAULT_CLUSTER_NAME
 884 };
 885